San Marino eSIM: How Much Data You Need (2026)

Set the daily rate first, then buy once. Light days of maps, texts and quick checks run 0.5 GB, or 4 GB across 7 days in San Marino. Standard days mixing social media, navigation and browsing run 1.5 GB, or 11 GB, and the 20 GB plan at $18.08 covers the moderate figure. Streaming days run 3 GB and reach 21 GB. Add 20% on top of whichever rate you pick, so you are not rationing data on the last morning.

Two traveler types, two shapes in San Marino. The leisure visitor on maps, photos and messaging fits a fixed tier: 11 GB across 7 days, which the 20 GB plan covers at $18.08. The streamer or remote worker fits unlimited days at $2.40, where running out is not on the table. The shortest unlimited commitment sold here is 1 day at $2.30. Unlimited days come from Holafly, catalogue-wide. HelloRoam and Airalo publish unlimited on part of the catalogue, so check the destination first. Nomad and Saily sell one shape only, a fixed bundle of gigabytes. The catch with Holafly: no per-GB tier exists, so it is unlimited or nothing.

If you only check maps and send messages in San Marino, 4 GB covers 7 days. The 5 GB plan at $4.78 handles that at $0.96/GB. If you scroll social media and browse regularly, step up to the 20 GB plan at $18.08 ($0.90/GB). If you stream video or work on video calls, you need 21 GB, and the 20 GB plan at $18.08 ($0.90/GB) is the largest tier sold here, so a heavy pace needs a second purchase or an unlimited plan.

Check three things: the model, the EID and the lock status. iPhone XS (2018) and later, Samsung Galaxy S20 and later, and Google Pixel 3 and later all handle eSIM. Dial *#06# and look for an EID number below the IMEI, which is the line that confirms support. Your phone also has to be carrier-unlocked. Pass all three and San Marino's 5G network connects on its own once the profile installs, with no SIM tray involved. Search results will show e SIM and e-SIM too. All three spellings point at the same thing.

Three events, one clock. Purchase: no countdown. Installing the QR code over WiFi: still no countdown. First connection to a San Marino mobile network: the countdown begins. That separation is what lets you set the phone up at home and arrive already connected. The 1 GB plan at $1.14 suits a short stay. The 20 GB plan at $18.08 suits a longer one. Buy within 3 days of departure and the window lines up with the trip.

One country plan covers one country. The signal ends where the country does. The San Marino 5 GB plan at $4.78 works out to $0.96/GB for a single-destination trip. A regional bundle trades a higher per-GB rate for one purchase across a route. Crossing borders? Airalo is the only one of the five selling a bundle that spans countries. No bundle from HelloRoam and Nomad, by their own published word. Holafly and Saily say nothing on the subject, so we score it as unstated. EU roaming regulation sits outside all of this and does not apply to prepaid travel eSIMs.

The photo sharer and the navigator both live inside the 1.5 GB moderate band in San Marino. The streamer and the remote worker both live on the 3 GB heavy band. That is the whole split, and it is the split the tier ladder is built around. The 5 GB plan at $4.78 covers a moderate traveller on a local mobile network, at $0.96/GB.

Moderate travelers in San Marino use 1.5 GB a day, so nights convert straight into a tier: 1 to 2 nights takes the 3 GB plan at $3.20 ($1.07/GB); 3 nights takes the 5 GB plan at $4.78 ($0.96/GB); 4 to 6 nights takes the 10 GB plan at $8.56 ($0.86/GB); 7 to 13 nights takes the 20 GB plan at $18.08 ($0.90/GB). Streamers and remote workers should add 20% before picking. The 10 GB plan holds the lowest per-GB rate here at $0.86/GB. Budget-focused travelers should compare that rate against the tier their nights actually require, because buying a bigger plan for a better per-GB rate stops paying once the extra data goes unused.

You commit to at least 1 day, which costs $2.30 in San Marino. If your trip runs longer, book the days upfront: the 30-day tier costs $1.97 a day, 18% below the $2.40 base rate. If you extend later instead, you pay the base rate for the extra days. Full 5G speed runs to 2GB a day before fair-use terms apply.

HelloRoam and Holafly publish the longest refund window of the five providers we score, at 180 days on an unactivated eSIM. Airalo publishes the shortest at 14. The full picture: HelloRoam and Holafly publish 180 days, Nomad and Saily 30 days and Airalo 14 days. That window only helps before you switch the plan on, so check the size the day you buy rather than the day you land in San Marino. Sizing up first is still cheaper than any refund: the 10 GB plan holds the lowest rate here at $0.86/GB.